PHP Misc. Functions

PHP Miscellaneous Introduction

The misc. functions were only placed here because none of the other categories seemed to fit.


The misc. functions are part of the PHP core. No installation is required to use these functions.

Runtime Configuration

The behavior of the misc. functions is affected by settings in the php.ini file.

Misc. configuration options:

Name Description Default Changeable
ignore_user_abort FALSE indicates that scripts will be terminated as soon as they try to output something after a client has aborted their connection “0” PHP_INI_ALL
highlight.string Color for highlighting a string in PHP syntax “#DD0000” PHP_INI_ALL
highlight.comment Color for highlighting PHP comments “#FF8000” PHP_INI_ALL
highlight.keyword Color for syntax highlighting PHP keywords (e.g. parenthesis and semicolon) “#007700” PHP_INI_ALL
highlight.default Default color for PHP syntax “#0000BB” PHP_INI_ALL
highlight.html Color for HTML code “#000000” PHP_INI_ALL
browscap Name and location of browser-capabilities file (e.g. browscap.ini) NULL PHP_INI_SYSTEM

PHP Miscellaneous Functions

Function Description
connection_aborted() Checks whether the client has disconnected
connection_status() Returns the current connection status
connection_timeout() Deprecated from PHP 4.0.5. Checks whether the script has timed out
constant() Returns the value of a constant
define() Defines a constant
defined() Checks whether a constant exists
die() Alias of exit()
eval() Evaluates a string as PHP code
exit() Prints a message and exits the current script
get_browser() Returns the capabilities of the user’s browser
__halt_compiler() Halts the compiler execution
highlight_file() Outputs a file with the PHP syntax highlighted
highlight_string() Outputs a string with the PHP syntax highlighted
hrtime() Returns the system’s high resolution time
ignore_user_abort() Sets whether a remote client can abort the running of a script
pack() Packs data into a binary string
php_strip_whitespace() Returns the source code of a file with PHP comments and whitespace removed
show_source() Alias of highlight_file()
sleep() Delays code execution for a number of seconds
sys_getloadavg() Returns the system load average
time_nanosleep() Delays code execution for a number of seconds and nanoseconds
time_sleep_until() Makes a script sleep until the specified time
uniqid() Generates a unique ID
unpack() Unpacks data from a binary string
usleep() Delays code execution for a number of microseconds

PHP Predefined Misc. Constants

Constant Description
CONNECTION_ABORTED Connection is aborted by user or network error
CONNECTION_NORMAL Connection is running normally
CONNECTION_TIMEOUT Connection timed out


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